Who said "I think inactivity is the enemy of thought."?

This quote is attributed to Gene Kelly.

I think inactivity is the enemy of thought. - Gene Kelly

"I think inactivity is the enemy of thought."

Gene Kelly Work

Dancer and Actor American 1912–1996

"I'd rather entertain and hope that people learned something than educate people and hope they were entertained."

"You've got to keep dancing."

"I like intelligent people. When you go out it should be with a person who's going to add to the experience, to feed your ideas."

"Life is not a spectator sport."

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."